Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue
Total revenue	$ 134,998	$ 128,438	$ 405,142	$ 387,149
Operating expenses
Property operating expenses	37,833	36,847	115,052	110,947
Real estate taxes	12,433	11,235	37,272	34,062
Third party management expenses	2,612	2,619	9,605	7,391
Depreciation and amortization	43,900	42,429	130,908	132,584
General and administrative expenses	5,963	5,813	22,209	21,797
Provision for impairment	56,865	0	56,865	3,057
Total operating expenses	159,606	98,943	371,911	309,838
Operating income (loss)	(24,608)	29,495	33,231	77,311
Other income (expense):
Interest income	1,220	79	2,564	635
Interest expense	(19,257)	(19,732)	(58,091)	(61,473)
Interest expense - amortization of deferred financing costs	(618)	(577)	(1,872)	(1,807)
Equity in income (loss) of Real Estate Ventures	1	(5,723)	(1,182)	(5,387)
Net gain (loss) on disposition of real estate	0	0	(35)	8,411
Net gain on sale of undepreciated real estate	0	953	2,859	953
Net gain on Real Estate Venture transactions	0	13,758	37,263	28,340
Net income (loss) before income taxes	(43,262)	18,253	14,737	46,983
Income tax (provision) benefit	0	793	(158)	1,032
Net income (loss)	(43,262)	19,046	14,579	48,015
Net (income) loss attributable to noncontrolling interests	339	(170)	(167)	(384)
Net income (loss) attributable to Brandywine Realty Trust	(42,923)	18,876	14,412	47,631
Distribution to preferred shareholders	0	0	0	(2,032)
Preferred share redemption charge	0	0	0	(3,181)
Nonforfeitable dividends allocated to unvested restricted shareholders	(80)	(73)	(280)	(245)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	$ (43,003)	$ 18,803	$ 14,132	$ 42,173
Basic income (loss) per Common Share	$ (0.24)	$ 0.11	$ 0.08	$ 0.24
Diluted income (loss) per Common Share	$ (0.24)	$ 0.11	$ 0.08	$ 0.24
Basic weighted average shares outstanding	178,602,622	175,433,657	178,515,993	175,315,581
Diluted weighted average shares outstanding	178,602,622	176,835,022	179,752,544	176,599,332
Distributions declared per Common Share	$ 0.18	$ 0.16	$ 0.54	$ 0.48
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	$ 134,998	$ 128,438	$ 405,142	$ 387,149
Operating expenses
Property operating expenses	37,833	36,847	115,052	110,947
Real estate taxes	12,433	11,235	37,272	34,062
Third party management expenses	2,612	2,619	9,605	7,391
Depreciation and amortization	43,900	42,429	130,908	132,584
General and administrative expenses	5,963	5,813	22,209	21,797
Provision for impairment	56,865	0	56,865	3,057
Total operating expenses	159,606	98,943	371,911	309,838
Operating income (loss)	(24,608)	29,495	33,231	77,311
Other income (expense):
Interest income	1,220	79	2,564	635
Interest expense	(19,257)	(19,732)	(58,091)	(61,473)
Interest expense - amortization of deferred financing costs	(618)	(577)	(1,872)	(1,807)
Equity in income (loss) of Real Estate Ventures	1	(5,723)	(1,182)	(5,387)
Net gain (loss) on disposition of real estate	0	0	(35)	8,411
Net gain on sale of undepreciated real estate	0	953	2,859	953
Net gain on Real Estate Venture transactions	0	13,758	37,263	28,340
Net income (loss) before income taxes	(43,262)	18,253	14,737	46,983
Income tax (provision) benefit	0	793	(158)	1,032
Net income (loss)	(43,262)	19,046	14,579	48,015
Net income attributable to non-controlling interests - consolidated real estate ventures	(20)	(12)	(46)	(25)
Net income (loss) attributable to Brandywine Realty Trust	(43,282)	19,034	14,533	47,990
Distribution to preferred shareholders	0	0	0	(2,032)
Preferred share redemption charge	0	0	0	(3,181)
Nonforfeitable dividends allocated to unvested restricted shareholders	(80)	(73)	(280)	(245)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	$ (43,362)	$ 18,961	$ 14,253	$ 42,532
Basic income (loss) per Common Share	$ (0.24)	$ 0.11	$ 0.08	$ 0.24
Diluted income (loss) per Common Share	$ (0.24)	$ 0.11	$ 0.08	$ 0.24
Basic weighted average shares outstanding	180,082,421	176,913,456	179,995,792	176,795,380
Diluted weighted average shares outstanding	180,082,421	178,314,821	181,232,343	178,079,131
Distributions declared per Common Share	$ 0.18	$ 0.16	$ 0.54	$ 0.48
Rents [Member]
Revenue
Lease revenue	$ 107,580	$ 102,557	$ 321,597	$ 307,446
Rents [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Lease revenue	107,580	102,557	321,597	307,446
Tenant Reimbursements [Member]
Revenue
Service and other revenue	20,557	17,239	59,094	53,812
Tenant Reimbursements [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Service and other revenue	20,557	17,239	59,094	53,812
Termination Fees [Member]
Revenue
Lease revenue	498	200	1,630	2,013
Termination Fees [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Lease revenue	498	200	1,630	2,013
Third Party Management Fees, Labor Reimbursement and Leasing [Member]
Revenue
Service and other revenue	4,944	6,918	17,531	20,483
Third Party Management Fees, Labor Reimbursement and Leasing [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Service and other revenue	4,944	6,918	17,531	20,483
Other [Member]
Revenue
Service and other revenue	1,419	1,524	5,290	3,395
Other [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Service and other revenue	$ 1,419	$ 1,524	$ 5,290	$ 3,395